package com.atguigu.gulimall.cart.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.cart.feign.ProductFeignService;
import com.atguigu.gulimall.cart.interceptor.CartInterceptor;
import com.atguigu.gulimall.cart.service.CartService;
import com.atguigu.gulimall.cart.to.UserInfoTo;
import com.atguigu.gulimall.cart.vo.CartItemVo;
import com.atguigu.gulimall.cart.vo.CartVo;
import com.atguigu.gulimall.cart.vo.SkuInfoVo;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.stream.Collectors;

import static com.atguigu.common.constant.CartConstant.CART_PREFIX;
/**
 * 获取用户登录或者未登录购物车里所有的数据
 * @author jingchun
 * @create 2024-07-20 22:53
 */

@Slf4j
@Service
public class CartServiceImpl implements CartService {

	@Autowired
	StringRedisTemplate redisTemplate;
	@Autowired
	ThreadPoolExecutor executor;

	@Autowired
	ProductFeignService productFeignService;


	@Override
	public CartItemVo getCartItem(Long skuId) {
		//拿到要操作的购物车信息
		BoundHashOperations<String, Object, Object> cartOps = getCartOps();
		String redisValue = (String) cartOps.get(skuId.toString());

		CartItemVo cartItemVo = JSON.parseObject(redisValue, CartItemVo.class);

		return cartItemVo;
	}

	@Override
	public CartItemVo addToCart(Long skuId, Integer num) throws ExecutionException, InterruptedException {
		//拿到要操作的购物车信息
		BoundHashOperations<String, Object, Object> cartOps = getCartOps();

		//判断Redis是否有该商品的信息
		String productRedisValue = (String) cartOps.get(skuId.toString());
		//如果没有就添加数据
		if (StringUtils.isEmpty(productRedisValue)) {
			//2、添加新的商品到购物车(redis)
			CartItemVo cartItemVo = new CartItemVo();

			//开启第一个异步任务
			CompletableFuture<Void> getSkuInfoFuture = CompletableFuture.runAsync(() -> {
				//1、远程查询当前要添加商品的信息
				R productSkuInfo = productFeignService.getInfo(skuId);
				SkuInfoVo skuInfo = productSkuInfo.getData("skuInfo", new TypeReference<SkuInfoVo>() {});
				//数据赋值操作
				cartItemVo.setSkuId(skuInfo.getSkuId());
				cartItemVo.setTitle(skuInfo.getSkuTitle());
				cartItemVo.setImage(skuInfo.getSkuDefaultImg());
				cartItemVo.setPrice(skuInfo.getPrice());
				cartItemVo.setCount(num);
			}, executor);

			//开启第二个异步任务
			CompletableFuture<Void> getSkuAttrValuesFuture = CompletableFuture.runAsync(() -> {
				//2、远程查询skuAttrValues组合信息
				List<String> skuSaleAttrValues = productFeignService.getSkuSaleAttrValues(skuId);
				cartItemVo.setSkuAttrValues(skuSaleAttrValues);
			}, executor);

			//等待所有的异步任务全部完成
			CompletableFuture.allOf(getSkuInfoFuture, getSkuAttrValuesFuture).get();

			String cartItemJson = JSON.toJSONString(cartItemVo);
			cartOps.put(skuId.toString(), cartItemJson);

			return cartItemVo;

		}else {
			//购物车有此商品，修改数量即可
			CartItemVo cartItemVo = JSON.parseObject(productRedisValue, CartItemVo.class);
			cartItemVo.setCount(cartItemVo.getCount() + num);
			//修改redis的数据
			String cartItemJson = JSON.toJSONString(cartItemVo);
			cartOps.put(skuId.toString(),cartItemJson);

			return cartItemVo;
		}
	}

	@Override
	public CartVo getCart() throws ExecutionException, InterruptedException {
		CartVo cartVo = new CartVo();
		UserInfoTo userInfoTo = CartInterceptor.toThreadLocal.get();
		if (userInfoTo.getUserId() != null) {
			//1、登录
			String cartKey = CART_PREFIX + userInfoTo.getUserId();
			//临时购物车的键
			String temptCartKey = CART_PREFIX + userInfoTo.getUserKey();

			//2、如果临时购物车的数据还未进行合并
			List<CartItemVo> tempCartItems = getCartItems(temptCartKey);
			if (tempCartItems != null) {
				//临时购物车有数据需要进行合并操作
				for (CartItemVo item : tempCartItems) {
					addToCart(item.getSkuId(),item.getCount());
				}
				//清除临时购物车的数据
				clearCartInfo(temptCartKey);
			}
			//3、获取登录后的购物车数据【包含合并过来的临时购物车的数据和登录后购物车的数据】
			List<CartItemVo> cartItems = getCartItems(cartKey);
			cartVo.setItems(cartItems);
		} else {
			//没登录
			String cartKey = CART_PREFIX + userInfoTo.getUserKey();
			//获取临时购物车里面的所有购物项
			List<CartItemVo> cartItems = getCartItems(cartKey);
			cartVo.setItems(cartItems);

		}

		return cartVo;
	}

	@Override
	public void clearCartInfo(String cartKey) {
		redisTemplate.delete(cartKey);
	}

	@Override
	public void checkItem(Long skuId, Integer checke) {
		//查询购物车里面的商品
		CartItemVo cartItem = getCartItem(skuId);
		//修改商品状态
		cartItem.setCheck(checke == 1?true:false);

		//序列化存入redis中
		String redisValue = JSON.toJSONString(cartItem);

		BoundHashOperations<String, Object, Object> cartOps = getCartOps();
		cartOps.put(skuId.toString(),redisValue);
	}

	@Override
	public void changeItemCount(Long skuId, Integer num) {

		//查询购物车里面的商品
		CartItemVo cartItem = getCartItem(skuId);
		cartItem.setCount(num);

		BoundHashOperations<String, Object, Object> cartOps = getCartOps();
		//序列化存入redis中
		String redisValue = JSON.toJSONString(cartItem);
		cartOps.put(skuId.toString(),redisValue);
	}

	@Override
	public void deleteIdCartInfo(Integer skuId) {
		BoundHashOperations<String, Object, Object> cartOps = getCartOps();
		cartOps.delete(skuId.toString());
	}

	@Override
	public List<CartItemVo> getUserCartItems() {
		List<CartItemVo> cartItemVoList = new ArrayList<>();
		//获取当前用户登录的信息
		UserInfoTo userInfoTo = CartInterceptor.toThreadLocal.get();

		//如果用户未登录直接返回null
		if (userInfoTo.getUserId() == null) {
			return null;
		} else {
			//获取购物车项
			String cartKey = CART_PREFIX + userInfoTo.getUserId();
			//获取所有的
			List<CartItemVo> cartItems = getCartItems(cartKey);
			if (cartItems == null) {

			}
			//筛选出选中的
			cartItemVoList = cartItems.stream()
					.filter(items -> items.getCheck())
					.map(item -> {
						//更新为最新的价格（查询数据库）
						BigDecimal price = productFeignService.getPrice(item.getSkuId());
						price=price!=null?price: BigDecimal.valueOf(0);
						item.setPrice(price);
						return item;
					})
					.collect(Collectors.toList());
		}

		return cartItemVoList;
	}


	/**
	 * 获取购物车里面的数据
	 * @param cartKey
	 * @return
	 */
	private List<CartItemVo> getCartItems(String cartKey) {
		//获取购物车里面的所有商品
		BoundHashOperations<String, Object, Object> operations = redisTemplate.boundHashOps(cartKey);
		List<Object> values = operations.values();
		if (values != null && values.size() > 0) {
			List<CartItemVo> cartItemVoStream = values.stream().map((obj) -> {
				String str = (String) obj;
				CartItemVo cartItem = JSON.parseObject(str, CartItemVo.class);
				return cartItem;
			}).collect(Collectors.toList());
			return cartItemVoStream;
		}
		return null;

	}

	private BoundHashOperations<String,Object,Object>  getCartOps() {
		//先得到当前用户信息
		UserInfoTo userInfoTo = CartInterceptor.toThreadLocal.get();

		String cartKey = "";
		if (userInfoTo.getUserId() != null) {
			//gulimall:cart:1
			cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserId();
		} else {
			cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserKey();
		}
		//绑定指定的key操作Redis
		BoundHashOperations<String, Object, Object> operations = redisTemplate.boundHashOps(cartKey);

		return operations;

	}
}
